Improvement in millstone-proofs



J. J. RYMAL.

y MILLsToINE-PROOFS. y No.188,192. Patented March 6,1877.

UNITED STATES PATENT QEEIGE.

JOHN J. RYMAL, OF MILWAUKEE, WISCONSIN.

IMPROVEMENT IN MILLSTONE-PROOHFS.

Specification forming part of Letters Patent No. 188, H92, dated March 6, 1877; application tiled February 3, 1876.

To all whom it may concern:

y the following is a specification:

My invention relates to devices for proving or testing' the accuracy of the faces of millstones; and consists iu the employment of a horizontal ring, or its equivalent, having a true plane face to sustain the ends of' the proof and red staffs, as hereinafter described.

rEhe essential feature ot' the invention is the use of the true adjustable plane, in combination with a millstone, to sustain the staffs and carry them accurately vover the grindingface ot' the stone.

The form, construction, and manner of adjusting the frame on which the plane face-is formed are matters of minor importance, and susceptible ot' modication; butI prefer to form the plane on the edge of a solid metal ring, adapted to surround the stone, and provided with vertical supporting and adjusting screws, as shown in the accompanying drawings, in which- Figure l represents' a perspective view ot' the ring by which the statts are supported and guided; Fig. 2, a plan view ot' the same in use; Figz, a vertical cross-section, showing the ring and red-statt' in position on the stone. Fig. 4 represents a vertical cross-section through one side of the plane or ring.

A represents an ordinary bed-stone of a grinding-mill; B, my annular plane or ring, and O the red-statt'. rlhe ring is made of suitable size to surround the stone, as shown in Figs. 2 and 3, with a true horizontal shoulder, or plane, c, around its interior, and with three vertical sup porting and adjusting screws, d, passingdown through it, as shown in all the figures.

In order to prove the stone the ring is placed around the same, suitable bearings provided for the screws to rest upon, and then the screws adjusted until the plane or shoulder c coincides exactly with the face of the stone. The proof and red staEs, being then applied across the t'ace of the stone, are supported at both ends upon the face e, and guided with perfect accuracy;

By-my improvement I-am enabled to prove the surface of the stone quickly andeasily, and with great precision. Instead ot' having the staffs of such length as to extend entirely across. the stone, they may be sustained at one end by the spindle in the case-ot' the lower stone; but it is considered advisable to have them supported in all cases at both ends upon the ring or plane. v

I am aware that it is old to secure a redstaft rigidly to a portable ring to rest upon the face of the stone; but such arrangement' is defective, forthe reason that when used 'upon a stone having an uneven surface theV v ring and staff are thrown out of a horizontal position by the irregularities in said surface.

My invention dii'ers from the above in having the plane which sustains and guides the stuit' supported independently ot` the face ot' the stone, and arranged to remain stationary while the staff' is moved upon it over the face of the stone, so that the staff is guided with perfect accuracy, notwithstanding the unevenness of the stone. fi

Having thus described my invention, what I claim isl. In combination with a millstone, a stationary plane arranged to sustain and guide a movable red-staff in itsl passage over the face of the stone, substantially as shown and described.

2. The ring B, constructed with a true face,

c, and provided with the screws d, substantially as shown and described.

3. The combination ot the lnillstone A, the stationary adjustable plane or ring B, and a movable staff, C, bearing upon and supported by the plane, substantially as shown and described.

JOHN J. RYMAL.

Witnesses:

E. H. BoT'rUM, JOHN F. BRUCE. 

